Abbreviation for "In Real Life." Often used in internet chat rooms to let people you are talking about something in the real world and not in the internet world. Also can be used to differentiate between an actor/actress and the character they play.

A great game, it's 100% pvp, best graphics ever, free until u turn 18 and then u get pwned by hax0rs called "da government" and they steal ur munies frum u til u so poor
but it's mostly a great game to play

In Real Life - Something people who have such a thing say on the Internet to irritate those of us who do not. These three letters send the average geek loner into a nostalgic flashback of better times in their childhood.